[LLVMdev] expanding i16 operations in presence of an i16 regclass.

[Sanjiv Gupta]

Reframing and Reposting my earlier query:

My target has 16-bit registers for indirect address of data.
All other registers are 8-bit.

Therefore I have added regclasses for i8 and i16 types.

All arithmetic operations (including pointer arithmetic ) are 8-bit
operations.

The problem is that LLVM does not expand i16 operations to i8 operations in
presence of i16 regclass.

What is the best way to tackle this?

Do I need to custom lower arithmetic operations during Legalize using
LowerOperation ( )?

- Sanjiv
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